Time FFT gives you much information about the changes in a signals frequency domain, and it is sometimes very useful to summarise that information. Time FFT statistics enables you to divide Time FFT results into different frequency segments and to calculate, display, and transfer summarised statistics reports to other programs.


By selecting “3D Tools/Time FFT statistics” from the menu, a dialog for statistics data display will appear. On the left side, 5 pairs of edit-boxes (From - To) are available, which show 5 possible frequency segments. You can enter segments boundaries here and press the “Calculate” button.


The calculation report will appear in a big edit-box showing you max, min, sum, avg. values for each segment. By pressing the “Clipboard” button, the complete report will be transferred to the clipboard, so you can then transfer it to some word processing program or Microsoft Excel.

If you use the Time FFT statistic often, you can create templates for segments that you use, so you would not have to type them every time. You can do this by creating a (or editing existing one) file called TFFTSTAT.RNG in SIGVIEW's application data directory (usually C:\Documents and Settings\<UserName>\Application Data\Sigview\). This file has the following structure:


from1-to1;from2-to2;from3-to3;from4-to4;from5-to5;Name1

from1-to1;from2-to2;from3-to3;from4-to4;from5-to5;Name2


where each row in a file represent a new template. FromX, toX are segment boundaries, NameX is the name of the template which will appear in the template combo-box. Initially, this file has only one row, which represents an empty template.

 

0-0;0-0;0-0;0-0;0-0;Empty


You can edit this file with any text editor.


If the file exists, its first row will be used as a default template as soon as you open the Time FFT statistics window. Afterwards, you can switch to other templates by choosing them from the Template combo-box.